Source Code/Intellectual Property
How much source code can be used without infringing on copyright or intellectual property concerns?
Re: Source Code/Intellectual Property
In the abstract, any literal infringement (that is, exact copying) is a problem. There is no bright-line rule that you can use up to 1% of a piece of software -- as long as the copied work satsifies the criteria for copyright, the right to copy any or all elements belongs to the copyright holder.
You should consult with a lawyer conversant with software copyright issues to discuss your specific fact situation, which (quite prudently) you have not shared in your question.
Best wishes,
LDWG